Liquid crystal display device and manufacturing method thereof

Abstract

To provide a liquid crystal display device and a manufacturing method thereof having high quality and high reliability by reducing damages to a connection terminal portion due to laser light when performing cutting of a substrate of a liquid crystal display panel using a plastic substrate at the connection terminal portion by irradiating laser light. In a liquid crystal display device in which a first light-transmissive substrate is opposite to a second light-transmissive substrate in which plural electrodes are formed on an inner surface and a connection terminal portion to the electrodes is formed by being drawn at an end portion, and liquid crystal is sealed in an area circumferential portions of which are surrounded by a sealant, a metal film reflecting laser light is formed on the inner surface of the first light-transmissive substrate opposite to the connection terminal portion, thereby blocking the irradiation of laser light to the connection terminal portion at the time of cutting by the irradiation of laser light.

1 . A liquid crystal display device in which a first light-transmissive substrate is opposite to a second light-transmissive substrate in which plural electrodes are formed on an inner surface and a connection terminal portion connected to the electrodes is formed by being drawn at an end portion, and liquid crystal is sealed in an area circumferential portions of which are surrounded by a sealant, wherein:
 a metal film reflecting laser light is formed on the inner surface of the first light-transmissive substrate opposite to the connection terminal portion.   
   
   
       2 . The liquid crystal display device according to  claim 1 ,
 wherein the length from an end surface on which the metal film is formed to the sealant in the first light-transmissive substrate is shorter than the length from an end surface on which the connection terminal portion is formed to the sealant in the opposite second light-transmissive substrate.   
   
   
       3 . The liquid crystal display device according to  claim 1 ,
 wherein the first light-transmissive substrate and the second light-transmissive substrate are made of a plastic base material.   
   
   
       4 . The liquid crystal display device according to  claim 1 ,
 wherein the metal film is formed continuously along only a cutting line portion of the first light-transmissive substrate.   
   
   
       5 . The liquid crystal display device according to  claim 1 ,
 wherein cutting traces due to the irradiation of laser light are formed at an end surface of the first light-transmissive substrate which is opposite to the connection terminal portion.   
   
   
       6 . A manufacturing method of a liquid crystal display device in which a first light-transmissive substrate is opposite to a second light-transmissive substrate in which plural electrodes are formed on an inner surface and a connection terminal portion connected to the electrodes is formed by being drawn at an end portion, and liquid crystal is sealed in an area circumferential portions of which are surrounded by a sealant, comprising the steps of:
 forming a metal film reflecting laser light on the inner surface of the first light-transmissive substrate opposite to the connection terminal portion;   irradiating laser light from the outside of the first light-transmissive substrate along an area within a film width of the metal film; and   cutting an end portion of the first light-transmissive substrate.   
   
   
       7 . The manufacturing method of the liquid crystal display device according to  claim 6 ,
 wherein the first light-transmissive substrate and the second light-transmissive substrate are made of a plastic base material.   
   
   
       8 . The manufacturing method of the liquid crystal display device according to  claim 6 ,
 wherein the metal film is formed continuously along only a cutting line portion of the first light-transmissive substrate.   
   
   
       9 . The manufacturing method of the liquid crystal display device according to  claim 6 ,
 wherein the film width of the metal film is larger than a width or a diameter of the laser light.